Maybe not "spy" but ex-security official at least. Not sure how thinly that's splitting hairs though.
Also as an unrelated nit: Ramat Hasharon isn't a "plush suburb", it's where people without enough money to buy an apartment in Tel Aviv go live (Tel Aviv being "valley" expensive)
Also people who live there identify it as a “plush suburb” themselves.
But even if your estimate is correct and the difference in prices is “categorical”, the author of the piece could simply have had in mind the streets with private houses, which mostly cost north of 1.5-2 million USD. This is rather plush, I guess.